Modification of C source

4.2.7 Modification of C source

By using expanded function object with high efficiency can be created. However, as expanded function is adapted in RH850 family, C source needs to be modified so as to use in other than RH850 family.

Here, 2 methods are described for shifting to the CC-RH from other C compiler and shifting to C compiler from the CC-RH.

-	#pragmaNote C source needs to be modified, when C compiler supports the #pragma. Modification methods are examined according to the C compiler specifications.

-	Expanded Specifications It should be modified when other C compilers are expanding the specifications such as adding keywords etc. Modified methods are examined according to the C compiler specifications.

Note

#pragma is one of the pre-processing directives supported by C90 and C99. The character string next to #pragma is made to be recognized as directives to C compiler. If that directive does not supported by the compiler, #pragma directive is ignored and the compiler continues the process and ends normally.

-	The CC-RH, either deletes key word or divides # fdef in order shift to other C compiler as key word has been added as expanded function.

Example 1.

Disable the keywords

#ifndef __CCRH__

#define interrupt       /*considered interrupt function as normal function*/

#endif

Example 2.

Change to other type

#ifdef  __v850e3v5__

#define _Bool char      /*change _Bool type variable to char type variable*/

#endif